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diff --git a/gnuradio-runtime/include/gnuradio/sync_interpolator.h b/gnuradio-runtime/include/gnuradio/sync_interpolator.h
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+++ b/gnuradio-runtime/include/gnuradio/sync_interpolator.h
@@ -0,0 +1,74 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2008,2013 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_GR_RUNTIME_SYNC_INTERPOLATOR_H
+#define INCLUDED_GR_RUNTIME_SYNC_INTERPOLATOR_H
+
+#include <gnuradio/api.h>
+#include <gnuradio/sync_block.h>
+
+namespace gr {
+
+  /*!
+   * \brief synchronous 1:N input to output with history
+   * \ingroup base_blk
+   *
+   * Override work to provide the signal processing implementation.
+   */
+  class GR_RUNTIME_API sync_interpolator : public sync_block
+  {
+  private:
+    unsigned d_interpolation;
+
+  protected:
+    sync_interpolator(void) {} // allows pure virtual interface sub-classes
+    sync_interpolator(const std::string &name,
+                      gr::io_signature::sptr input_signature,
+                      gr::io_signature::sptr output_signature,
+                      unsigned interpolation);
+
+  public:
+    unsigned interpolation() const { return d_interpolation; }
+    void set_interpolation(unsigned interpolation)
+    {
+      d_interpolation = interpolation;
+      set_relative_rate(1.0 * interpolation);
+      set_output_multiple(interpolation);
+    }
+
+    // gr::sync_interpolator overrides these to assist work
+    void forecast(int noutput_items,
+                  gr_vector_int &ninput_items_required);
+    int  general_work(int noutput_items,
+                      gr_vector_int &ninput_items,
+                      gr_vector_const_void_star &input_items,
+                      gr_vector_void_star &output_items);
+
+    // derived classes should override work
+
+    int fixed_rate_ninput_to_noutput(int ninput);
+    int fixed_rate_noutput_to_ninput(int noutput);
+  };
+
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_RUNTIME_SYNC_INTERPOLATOR_H */